We've just finished up our real-time 3d visualization of the L'Anse Aux Meadows Viking Landing site in Newfoundland, Canada. It's part of the Great Unsolved Mysteries in Canadian History website.
Official media page
Direct link to Setup.exe
We used CEGUI, Ogre3d, and Newton Game Dynamics.
There's not much to do besides walk around a Viking site from 1000 CE, but that's the whole point.
If you'd like to check out more of what our company does, visit www.visualization.ca